8. Unscrew the optical fiber’s connector to disconnect the fiber from the OTDR’s port.
9. Using the two handles on the module, pull up the module to remove it from the unit’s casing.
10. Clean the port of the new OTDR.
11. Clean the optical fiber connector (see Cleaning and Connecting Optical Fibers on page 77).
12. Carefully align the module with the anchoring pins at the bottom of the unit’s casing.
13. Insert the new module, ensuring that it lays flat on the bottom of the unit’s casing.
14. Connect the optical fiber to the module (see Cleaning and Connecting Optical Fibers on page 77).
15. Place the retaining tab back into place, over the OTDR.
16. Turn the screw of the retaining tab clockwise until the tab is secured in place.